-bluetooth speaker -wireless -Support USB ,TF, , -for MP3/4,PC,mobilephone -Rechargeable battery Product No.: ... mode) Long press: "VOL+" 4.[USB]: Charging and USB card reader; USB cable can connect the computer's USB interface, LED display 'PC' mode,then ... stereo,also connect the amplifier device. 6.[TF CARD]:Insert TF card, play audio files Fashionable and Portable Wireless Mini bluetooth speaker ...